Ventilator and chimney cap



' WITNESSES R. T. MERRILL. VENTILATOR AND CHIMNEY CAP.

APPLICATION FILED APR. 13, 1921.

mrmm. v Patented May 30, 1922.

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ROBERT T. MERRILL, OF lllIIL'WA'UFrTIEE, VI SCONSIN, ASElIG-NOR TO GR-DWN VENTI- CGNEIN, A CDR-LPORATZON OF VTISCGNSIN.

VENTILATOB, AND CHHENEY CAP.

Specification of lfiefitersi'etent- Patented HayEO, 1922.

Application filed April 13, 1921. Serial No. 460,927.

T 0 all whom it may concern Be it known that l, lionnn'r T. h lnnnirm, a citizen of the United States, and resident of Milwaukee, county of h lilwaulrec, and State of Wisconsin, have invented new and useful Improvements in Ventilators and Chimney (laps, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

This invention relates to ventilators and chimney caps, or the like, and has for its object to improve upon the construction shown in my United States Letters Patent No. 915,871, of March 1909 and N0. 1,037,286, of September 3, 1912, by providing the same with means for breaking up the cross draft and merging the down drafts with the updraft.

The invention further consists in the several features hereinafter set forth and more particularly defined by claims at the conclu sion hereof.

In the drawings: Fig. 1 is a vertical sectional view of a device embodying the invention; Fig. 2 is a plan view of the same inverted, a portion being broken away; Fig. 3 is adetail view of one of the radial ribs or artitions.

n the drawings 4 indicates a draft tube or pipe which. may be connected to a chimney top or ventilator tube in the ordinary way. An upper frusto conical deflector 5 and a lower annular frusto conical deflector 6 are connected together in spaced relation by vertical radially disposed partitions 7 and 8 and are secured to the tube 4; by means of these partitions which have angled portions 9 riveted to the tube.

The upper frusto conical deflector is provided with a central opening 10, preferably of slightly smaller diameter than the tube, and is surmounted by a cap ll bent to form alternate radial ridges, and the portions of the cap between the ridges form series of radial air outlet passages.

The inner free portions of the radial ribs or partitions 7 extend inwardly to a point near the vertical axis of the tube so as to converge and guide the air currents for a suificient distance across a port-ion of the opening in the draft tube to improve the draft of said tube and prevent air eddies forming above the draft tube, which would retard the draft in said tube, and the partitions 8 do likewise but extend to the axis of the tube and carry deflector plates 12.

These deflector plates 12 are preferably disposed at right angles to each other and form extensions of the partitions 8 to which they are secured at their upper edges, though they may be separate from the ribs and be secured directly to the tube 4. The plates 12 at their outer edges are spaced a short distance from the inner wall of the tube and they project downinto said tube. The purpose of these extensions of the radial partitions above the tube is to prevent the possibility of cross drafts by breaking them up and deflecting them down into the tube 4 without interfering with the updraft and in order that this downwardly deflected air may be gradually merged with the updraft the lower edges of said plates are inclined downwardly from their outer edge to the axis of the tube. The action of these plates on the air passing through the annular passage between the deflectors 5 and 6 is indicated by arrows in Fig. 1. It will be noted that some of the air is deflected upwardly, mixing directly with the updraft, while some of the air is deflected downwardly along one of the plates and then gradually merges with and passes upwardly with the air passing out from other portions of the tube. In this way cross drafts which might interfere with the proper operations of my prior devices have been effectively dealt with.

I desire it to be understood that this invention is not limited to any specific form or arrangement of parts except in so far as such limitations are specified in the claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a ventilator and chimney cap, the combination, with a draft tube, a frusto conical deflector provided with a central opening, a second frusto conical deflector located above said tube and first named deflector and provided with a central opening, and radial ribs connecting the two deflectors and extending toward the axis of the tube, of deflectors extending into and across the tube for breaking up cross drafts.

2. In a ventilator and chimney cap, the combination, with a draft tube, afrusto conical deflector provided with a central opening, a second deflector located above said tube and first named deflector and pro vided with a central opening, and radial ribs combination,

connecting the two deflectors and extending toward the axis of the tube, of deflector plates forming extensions of some of the ribs and depending into the tube to break up cross drafts.

3. In a ventilator and chimney cap,

with a draft tube, a frusto conical deflector provided with a central opening, a second deflector located above said tube and first named deflector and provided with a central opening, and radial ribs connecting the two deflectors and extending toward the axis of the tube, of: deflector plates extending into and disposed. radially of the tube and meeting at the axis thereof, said deflector plates having their lower edges inclined to the axis of said tube.

4. In a ventilator and chimney cap, the

combination,

the

with a draft tube, a frusto conical deflector provided with a central opening, a second deflector located above said 'tube and first named deflector and provided with a central opening, and radial ribs connecting the two deflectors and extending toward the axis of the tube, of deflector plates depending into and meeting at the axis of said tube and forming extensions of some of the ribs, said deflector plates having their lower edges inclined from the wall to the axis of said tube.

In testimony whereof I affix my signature in presence of two witnesses.- ROBERT T. MERRILL. Witnesses:

J. PALUOHNIAK, W. C. AHLHAUSER. 

